Improvement in flasks for casting pipe



JOHN DEMAHEST.

Improvement in Flasks for Casting Pipes. No. 113,986.PatentedApril25,187l.

witmmz UNITED STATES PATENT QFFIGE.

JOHN DEMAREST, OF MOTT HAVEN, NEW YORK, ASSIGNOR TO HIMSELF AND JORDANL. MOTT, OF SAME PLACE.

IMPROVEMENT IN FLASKS FOR CASTING PIPE.

Specification forming part of Letters Patent No. 113,986, dated April25, 1871.

To all whom it may concern:

Be it known that I, JOHN DEMAREST, of Mott Haven, in the county ofWestchester and State of New York, have invented a new and usefulImprovement in Casting Pipe; and I do hereby declare that the followingis a full, clear, and exact description thereof, which will enableothers skilled in the art to make and use the same, reference being hadto the accompanying drawing, forming part of this specification.

This invention relates to improvements in casting pipe and otherarticles in which long horizontal cores are employed; and it consists inan improved mode of adjusting the cores to counteract their tendency tospring upward at the center by floating on the molten metal while themold is being filled, by which the pipes are made thicker on the lowerside along the middle, and thinner on the upper side, which it is veryimportant to avoid.

Figure 1 is a longitudinal section of a mold with my improvedcore-molding attachments, and Fig. 2 is an end elevation of the same.

I propose to apply the long and strong projections A to the lower partof the flask B, one at each end, and the short ones 0 to the upperflask, D, for the support of temper screws E F, by which I cramp thecore-bar Gr so as to spring it down at the center about as much as itsprings upward by the action of the metal, so that when the castingtakes place it will be centered truly with the mold.

The screws may be adjusted from time to time as the first castings aremade until they are found to be rightly adjusted as to the amount thecore is to be sprung down; or the screws may be adjusted for each cast.The tendency of the upper part of the flask to rise by the action of thescrews F on the core will be counteracted by the fastening of the twoflasks togetherby clamp-screws or other means.

The projection C may also be applied to the lower part of the flask, ifpreferred, in which case they would be placed at one side of the cavityH for the corebar, and be suitably raised above the core-bar to supportthe screws F above. I prefer, however, the arrangement which I have hereshown.

Having thus described my invention, I claim as new and desire to secureby Letters Patent The combination, with the flask and the core-bar, ofthe screw-supporting projections A O and the temper-screws E F, arrangedfor springing the core downward along the middle, substantially asspecified.

JOHN DEMAREST.

Witnesses:

GEO. W. MABEE, ALEX. F. ROBERTS.

